<!DOCTYPE HTML>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>+操作符</title>
  <script type="text/javascript">
    var mynum = 1 + 5;
    var mychar = "中" + "国";
    document.write("mynum的值:" + mynum + "<br>");
    document.write("mychar的值:" + mychar);
  </script>
</head>

<body>
</body>

</html>